Fin material for brazing

Abstract

An aluminum alloy fin material for brazing which is composed of an aluminum alloy comprising above 0.1 wt % to 3 wt % of Ni, above 1.5 wt % to 2.2 wt % of Fe, and 1.2 wt % or less of Si, and at least one selected from the group consisting of 4 wt % or less of Zn, 0.3 wt % or less of In, and 0.3 wt % or less of Sn, and further comprising, optionally, at least one selected from the group consisting of co, Cr, Zr, Ti, Cu, Mn, and Mg in given amounts, the balance being unavoidable impurities and aluminum, wherein a ratio of the grain length in the right angle direction/the grain length in the parallel direction is 1/30 or less, an electric conductivity is 50 to 55 %IACS, and a tensile strength is 170 to 280 MPa.

What we claim is:  
     
       1. An aluminum alloy fin material for brazing which is composed of an aluminum alloy comprising more than 0.1 wt % but 3 wt % or less of Ni, more than 1.5 wt % but 2.2 wt % or less of Fe, and 1.2 wt % or less of Si, and at least one selected from the group consisting of 4 wt % or less of Zn, 0.3 wt % or less of In, and 0.3 wt % or less of Sn, and further comprising, optionally, at least one selected from the group consisting of 3.0 wt % or less of Co, 0.3 wt % or less of Cr, 0.3 wt % or less of Zr, 0.3 wt % or less of Ti, 1 wt % or less of Cu, 0.3 wt % or less of Mn, and 1 wt % or less of Mg, and any unavoidable impurities with the balance being aluminum, wherein a ratio of a length in right angle direction to the rolling direction of an individual grain viewed from the sheet surface to a length of the grain in the parallel direction to the rolling direction (the grain length in the right angle direction/the grain length in the parallel direction) is 1/30 or less, an electric conductivity is 50%IACS or more but 55%IACS or less, and a tensile strength is 170 MPa or more but 280 MPa or less. 
     
     
       2. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the aluminum alloy contains 0.9 wt % or more but 2 wt % or less of Ni. 
     
     
       3. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the aluminum alloy contains more than 1.5 wt % but 2.0 wt % or less of Fe. 
     
     
       4. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the aluminum alloy contains 0.4 to 0.7 wt % of Si. 
     
     
       5. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the aluminum alloy contains 0.3 to 1.0 wt % of Zn. 
     
     
       6. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the aluminum alloy contains 0.3 to 2.0 wt % of Co. 
     
     
       7. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the aluminum alloy contains more than 0.05 wt % but 0.3 wt % or less of Cu. 
     
     
       8. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the ratio of the grain length in the right angle direction/the grain length in the parallel direction is 1/1000 to 1/40. 
     
     
       9. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the electric conductivity is 52 to 55%IACS. 
     
     
       10. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the tensile strength is 180 to 240 MPa. 
     
     
       11. The aluminum alloy fin material for brazing as claimed in  claim 1 , wherein the aluminum alloy fin material for brazing is obtained by subjecting the alloy to a continuous cast-rolling method and then subjecting the alloy to a cold rolling step.